Spot-light attachment for projection apparatus.



E. P. RAUSGHERT.

SPOT LIGHT ATTACHMENT FOR PROJECTION APPARATUS.

APPLICATION FILED JUNE 7, 1913 Patented Mar. 3, 1914.

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' UNITE STATES PATENT ()FFIGE.

EIVIIL P. BAUSCHERT, OF LAKE MILLS, WISCONSIN.

SPOT-LIGHT ATTACHMENT FOR PROJECTION APPARATUS.

To all whom it may concern:

Be it known that I, EMIL P. RAUsoH'an'r, a citizen of the United States,residing at Lake Mills, in the county of Jefferson and State ofWisconsin, have invented certain new and useful Improvements inSpot-Light. Attachments for Projection Apparatus.

The apparatus heretofore used for producing a spot light has included alamp, relatively large condensing lenses, and a large disk carryingcolored transparent sheets, to be interposed in the path of the beam oflight. Such an apparatus is not only expensive, but is of such size thatit cannot be placed in the operators booth of the ordinarymoving-picture theater.

The object'of my invention is to provide a spot-light-producingapparatus that shall be of such size that it may be used in a smallbooth, and that shall be inexpensive. This object I attain by utilizingthe lamp of the be made of small diameter.

picture machine as the source of light, and by providing a set ofadjustable mirrors arranged to be positioned in front of the lenstube ofthe picture machine. IVhen colored lights are desired, a disk bearingcolored transparent plates may be associated with the set of mirrors.Owing to the relatively small size of the beam of light at the pointwhere it leaves the lens tube, said disk may Instead of varying the sizeof the spot of light by adjusting the position of the'lamp, as in thelarge machines of the prior art, I utilize the slide carrier of thepicture machine, placing in said carrier a slide having an aperture ofthe desired size.

I have illustrated one embodiment of my invention by the use of theaccompanying drawings.

Figure l of the drawings is a rear elevation of the spot-lightattachment. Fig. 2 is a front elevation of the same with the disk forproducing the various colored lights omitted; and Fig. 3 is a verticalcentral section of the device showing how it is to be placed withrelation to the projection apparatus, the essential elements of therojection apparatus being indicated in dotted lines.

The present embodiment of my invention comprises a rotary disk which isso placed in front of the projecting lenses of the projecting apparatusas to receive the light from the lenses mear the periphery of the disk,sothat, as thepdisk is rotated. the light Specification of LettersPatent.

Application filed June 7, 1913.

Sefial No. 772,301.

will pass through openings in the disk near its periphery; and by havingthe respective openings covered with different colored transparent filmsthe light which passes through the openings and films, and upon thedistant object, will be colored in accordance with the particular filmthat may be used. One of the openings, however, contains nofilm andtherefore transmits the normal light; and one portion of the disk isleft without an opening so that the light may he bythis portion entirelyexcluded. As the light passes through any one of the openings, it fallsupon a mirror so placed as to reflect the light upward substantially,

may be necessary. I To facilitate the application of the device to theprojection apparatus and its removal therefrom, the device is arrangedon slides by means of which it is slid tothe proper place adjacent thepro- Patented Mar.3,1914.

j ecting lens, orit may be removed therefrom without delay.

In the particular embodiment of my invention which I have illustratedherein, I make use of a disk 5 composed of sheet metal, or othersuitable material, stiffened by means of the encircling ring 6 and thespokes 7. The disk is rotatably supported on a frame-work or casing Sbymeans of a pin 9 passing through the center of the disk and fixed at itsinner end to the casing by means of a nut 10. The spring 11 encirclesthe pin, and is compressed between the disk" 5 and the collar 12 on theouter end of, the pin, and thus produces suflicient friction resistingthe rotation of the disk tohold the disk in position after it has beensuitably rotated. Near the periphery of the disk are a plurality ofopenings-12, and covering some of these openings are sheets or films 13of variously colored transparent material. Any suitable material maybeus'ed for the purpose; I prefer the use of gelatin. These films'areheld in place by means of strips 14 of metal, or other suitablematerial, which are held in place, by means of spring clip 15, adjacentto the spokes 7, and which thus securely fasten in- ,place the coloredfilms of gelatin. One, or more, of the onenlens, or may be removed asdesired.

. ter therewith; and the-particular color of 1 or the spot-lightprojected upon the stage.

) the attachment along the rods 34 until the ings is left uncovered, anda portion 16 of the disk contains no aperture.

A cylinder 17 is attached to the lower portion of the casing by means ofa lug 18 fixed to the casing immediately below the lower edge of thedisk; and, registering with. this cylinder, is an opening 17 in thecasing 8. As the disk is rotated the openings therein pass between thecylinder 17 and the opening 17 in the casing, and regislight which isprojected upon the screen will depend upon the color of the film ofgelatin covering the particular opening which is allowed to remainopposite the cylinder. The light which is to be projected is generatedby passing a current of electricity through the carbons 21 so as t forman arc in the space 22, and the light passes in the usual manner throughthe condensing lenses 20 and the projecting lens 19, and thence throughthe cylinder 17 and the openings 12 and 17 As the light passes throughthe opening 1'? it falls upon the mirror 24:, which is fixed to the rod25. This rod is journaled in bearings 26 fixed to the casing 8, so thatwhen the rod, by means of the handle 27, is rotated the mirror 24.- willbe inclined at any desired angle. The light striking on the mirror willbe reflected upwardly and will strike upon the mirror 28 which is fixedto the rod 29. This rod 29 is journaled in bearings 30 in the casing ofthe device, and may be rotated by means of the handle 31. n

The device is supported in any suitable manner. Herein I have shown itsupported on the table 32 to which are attached lugs 83 which supportrods 34 on which are slidably mounted the legs 35 of the device. By thismeans the device may be slid to its proper position in front of theprojecting In'use a special plate, or slide, 23 is inserted in theordinary slide carrier of the projecting apparatus. This plate 23 has anopening 23 therethrough which is concen trio with the axis of the lenssystem, and e size of the opening determines the size By the use ofplates having openings of various sizes, the size of the spot-light maybe varied as desired without in any way disturbing the light or thelenses of the projecting apparatus.

When the operator of the picture machine desires to throw a beam oflight upon a peron the stage or in the audience, he places a slide 23 inthe slide carrier, and pushes 'nder 1i registers with the projecting lhe projecting apparatus. The dish "of ntil the des' ec light, passesthrough the opening 17 and falls upon the mirror 24, is reflectedupwardly, falls upon the mirror 28 and is reflected forwardly. By meansof the handle 27 the mirror 2& may be rotated around the axis of the rod25 so as to throw the upwardly passing beam toward the rightor the leftof the operator, or of the stage. The mirror 28 may be rotated aroundthe axis of the rod 29 so as to throw the light horizontally, or aboveor below the'horizontal direction as much as may be desired. So that bymeans of these mirrors light may be directed to any point on the stage.If it is desired to shut oil? the light, the portion 16 of the disk isrotated into the pathway of the beam of light. In order that the bestresults may be obtained, it is desirable to have the mirrors groundsmooth so that all irregular reflections will be avoided; and also tohave the glass as thin as possible so as to substantiallyeliminate the.effects of the secondary reflection from the surface of the glass; Inorder to avoid any movement of the mirrors after they have been properlypositioned, springs 36 and 37 are provided. These springsare compressedbetween the respective bearings 26 and 30 and the adjusting nuts 38 and39, sothat in each case the friction caused thereby will prevent. theinadvertent rotation of the mirrors.

A slot 40 is provided in the casing through which a screw 4.1 passes.The screw 41 holds in place the bearing 30 of the shaft 29, and byloosening this screw the bearing may be shifted upwardly or down wardlyso as to incline to a limited extent the shaft 29.

Although I have described with some particularity various details of theapparatus which I have chosen to illustrate my invention, yet it is tobe understood that modifications therein may be made by those skilled inthe art without departing from the spirit of my invention as set forthin the following claims.

I claim as my invention:

1. A spot-light attachment for projection apparatus comprising a disk,said disk having a plurality of openings therethrough equidistant fromthe center of said disk;

films covering some of said openings, said films being transparent tocertain colors only; a casing rotatably supporting said disk, saidcasing having an opening there through which registers respectively withthe openings through said disk as the disk rotates; an inclined mirrormountedin said casim adjacent the opening in said casing; pi :edinclined mirror mounted in said casing; said casing having a secondopening therethrough adjacent said second, mirror; for rotating saidpivoted mirror; and means for movably supporting said casing.

' A spot-light attachment projection apparatus comprising a disk, saiddisk havmg a plurality of openings therethro-ugh.

equidistant from the center of said disk;

colored sheets covering some of said openings; disk, said casing havingan opening therea casing rotatably supporting said through whichregisters respectively with the openings through said diskas the diskrotates; a pivoted inclined mirror mounted in said casing adjacent theopening in said.

'ings; a casing having an opening therethrough which registersrespectively with the openings through said disk as the disk rotates; aninclined mirror mounted in said casing adjacent the opening in saidcasing; a pivoted inclined mirror mounted in said casing; said casinghaving a second opening therethrough adjacent said second mirror; andfrictional means resisting rotation of said disk.

4. A spot-light attachment for projection apparatus comprising a disk,said disk having a plurality of openings theret-hrough equidistant fromthe center of said disk; transparent colored sheets covering some ofsaid openings; a casing rotatably supporting said disk, said casinghaving an opening t-herethrough which registers respectively with theopenings through said disk as the disk rotates; a pivoted inclinedmirror mounted in said casing adjacent-the opening in said casing; asecond pivoted inclined mirror mounted in said casing, said casinghaving a second opening therethrough adjacent said second mirror; meansfor rotattional means resisting the rotation of said mirrors.

5. A spot-light attachment for projection apparatus comprising a disk,said disk hav ing a plurality of openings therethrough; sheets coveringsome of said openings, said sheets being transparent to certain colorsonly; a casing upon which said disk is rotatably mounted, said casinghaving an opening therethrough which registers respectively with theopenings through said disk mounted in said as the disk rotates; a mirror1n said casing;

casing adjacent the opening casing mg each of said mirrors andadjustable frica second mirror mounted in said casing, said having asecond opening therethrough adjacent said second mirror; means forrotating each of said mirrors; and a cylinder attached to said casingsubstantially concentric with the first mentioned opening through saidcasing.

6. A spot-light attachment for projecting apparatus comprising memberhaving an opening therethrough, a casing movably supporting said member,said casing having an opening therethrough adapted to register with theopening through said member, an inclined mirror mounted in said casingadj acentthe opening in said casing, a pivoted mirror mounted in saidcasing, said casing having a second opening therethrough adjacent saidsecond mirror, means for rotating said pivoted mirror, and means formovably supporting said casing.

7'. A spot-light attachment for projecting apparatus comprising amember, said member having a plurality of openings therethrough, coloredfilms covering said open' -1ngs, a casing movably supporting saidmember, said casing having an opening therethrough tively with theopenings through said member as the member is moved, an inclined mir rormounted in said casing adjacent to the opening of said casing, a pivotedmirror mounted in said casing, said casing having a second openingtherethrough adjacent said second mirror, means for rotating saidpivoted mirror, and means for movably sup porting said casing.

8. The combination of a source of light,

a system of lenses for retracting a beam of light from said source,means for varying the dlrection of said beam, and means whereby saidvarying means may be brought into coaction with said beam of light.

9. A spot-light attachment for projecting apparatus comprising a casinghaving alight-admitting opening, an inclined mirror mounted in saidcasing adjacent said opening, an adjustably mounted mirror in saidcasing arranged to reflect a beam of light received from the firstmentioned mirror, said casing having an opening adjacent said secondmirror for the exi t of the light, means for adjusting said adjustablemirror, means for coloring the light, and means for movably supportingsaid casing.

In testimony whereof I aiiix my signature in presence of two witnesses.

EMIL P. RAUSCHERT.

Witnesses EARL C. CARLsoN, GEORGE L. CI-IINDAHL.

floplu of thin patent mly be obtained for live cents each, by addressingthe flommhllener of Plum", Washington, D. G.

adapted to register respec

